Shedding light on dark DNA Most textbook definitions of evolution state that it occurs in two stages: mutation followed by natural selection. DNA mutation is a common and continuous process, and occurs completely at random.
The average adult only eats 15 grams of fiber per day. Women need 25 grams of fiber per day, and men need 38 grams per day, according to the Institute of Medicine.
How Much Fiber Should I Eat Each Day? Depending on your gender and age, you should try to consume 20-38 g of fiber per day. Men ages 50 and younger should try to eat 38 g of fiber per day, and men 51 years and older should shoot for 30 g per day. Women ages 50 and younger should aim for 25 g per day and women 51 years and older should consume 21 g of fiber per day. Most Americans are currently eating half of the recommended amounts of fiber each day. Read your food labels to find out how much fiber (in grams) is in each serving of your favorite foods.